Ottorino Quaglierini (18 May 1915 – 26 July 1992), born in Livorno, was an Italian rower who competed in the 1936 Summer Olympics.
On 15 August 1936 he won the silver medal as crew member of the Italian boat (Guglielmo Del Bimbo, Dino Barsotti, Oreste Grossi, Enzo Bartolini, Mario Checcacci, Dante Secchi, Enrico Garzelli; helmsman Cesare Milani) in the eight event. With the same crew he won the gold medal in 1937 at the European championships in Amsterdam, and the bronze medal in Milan the following year.
Ottorino Quaglierini was member of Unione Canottieri Livornesi, nicknamed scarronzoni derived from their ungraceful manner of rowing.